from math import gcd
N = int(input())
a, b, c = map(int, input().split())

ab_lcm = a * b // gcd(a, b)
bc_lcm = b * c // gcd(b, c)
ca_lcm = c * a // gcd(c, a)
abc_lcm = a * b * c // (gcd(a, b) * gcd(b, c) * gcd(c, a))
print(N // a + N // b + N // c - (N // ab_lcm + N // bc_lcm + N // ca_lcm) + N // abc_lcm)